So this index is a Level 1 Index with a root block and 21 Leaf Blocks. The first entry always corresponds to the index root block and is followed by the 21 leaf blocks. Each leaf block entry details the relative block address, the sequence number, the number of index entries (nrow) and the number of non-deleted index entries (rrow).

We notice that it now correctly details how many non-deleted index entries we now have in the first leaf block (85). Unfortunately, the free space remains the same and doesn’t take into account the deleted index entries (still recorded as 828 bytes).

Of course, if we perform any additional DML that impacts this leaf block such as another delete: